MP4 conversion

[alexarje]

Why is a .avi file converted to .mp4 by default? Is that for showing in notebook-mode?

I guess it is fine because, in most cases, people would probably load .mp4 files (myself included).

[alexarje]

Ok, here is an odd example of conversion:

Loading a .avi file which is converted back and forth many times... I guess it would be good to avoid converting to mp4 unless one specifies mode=notebook?

[joachimpoutaraud]

Thanks for reporting that issue! There was actually an else statement that was missing in the __init__ file. The consequence was that every file was systematically converted to mp4. I have fixed the issue and updated the repository.